That's a lot of info. I'll be concise. Kabr, Praedyth, Alemyr, and maybe others descended into the Vault. After a serious of events, Kabr was the only one to escape, everyone else being lost to time or wiped from existence. Kabr went insane after realizing that he once had a fireteam that he couldn't remember. Pahanin Errata witnessed this fall. Kabr slowly became corrupted by the Vex. He pierced the Vault and created the Aegis from the chassis of a Gorgon and his last light. If his body still exists, his mind is no longer inside